Dig the crowns when they are dormant, but you need to make sure the ground is thawed too. Mark them so you'll remember where they are.
And don't move the whole thing, just hack off a good chunk, I wouldn't go with anything bigger than 12" in any direction.
I was planning on digging them up in late September when I harvested the cones, but I will see if the landowners mind me going back later in the fall/winter.
If the person giving is hopeing to get rid of the hops by letting you take them they have a nasty suprise coming next spring. Hops are almost as hard as horseradish to really get rid of. just one little piece of rhyzome left will regenerate into the same of monster after a few years.
Funny you should point that out. The landowners have been trying to kill them off for a few years. Apparently, someone told them it was illegal to grow hops! She was happy to hear she wasn't in violation of the law. However, they are planning on moving the historic shop and building a new shop on that site. Since the plants probably won't survive being under a couple feet of concrete, she was happy I was interested in taking a few and would be able to make good use of them.